$\tan a\left(\frac{8}{15}\right)$
$\int2x\:sen\left(4x\right)dx$
$\left(a+20b\right)^2$
$\left(4mn^2+3\right)^2$
$x+5\cdot x+5$
$\left(7a-3b^2\right)^2$
$\left(6\right)-\left(+5\right)-\left(+4\right)-\left(-2\right)-\left(+1\right)$
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